The questions in the student material are designed to be the basis of a class discussion. They are not designed to be a homework assignment. Your input into the discussion is essential.
The anticipated outcomes for Part 5: Refraction are for students to:
use the law of refraction to predict the path of a ray of light as it passes from one material to the other
describe and name the images formed by convex and concave lenses
explain why convex lenses can form real images but concave lenses cannot.
These outcomes should be indicated in the answers to the questions.
In the closing discussion, the following questions may be appropriate.
Activity 1: Exploring prisms
How does the depth appear to change when looking through denser materials such as water?
Was it possible to see through adjacent sides of a rectangular prism?
How can a triangular prism be used to change the direction of viewing?
Activity 2: Lenses and images
What type of lenses are usually found in a microscope and a pair of binoculars and a magnifying glass?
What type of lens is usually found in optical devices, such as projectors, that project images onto screens?
Activity 3: Lenses and refraction
Name several optical devices that make use of real images?
When you look down a microscope are you seeing a real or a virtual image?
When you look at an insect through a magnifying glass, are you seeing a real or a virtual image?
Activity 4: Gems
Describe how the optical density of a gem stone affects the amount of refraction of a ray of light entering that gem stone.
Suggest how the optical density of a gem stone might affect the amount of refraction of a ray of light when it leaves the gem stone.
Describe how the amount of refraction could be used to identify if a crystal vase is real crystal or just glass.
You might ask the students to write a summary at this stage.
